I like my water very cold, but I do notice that I'm always freezing when I'm drinking it. However, drinking very cold water actually legitimately burns calories!

A food calorie (actually, a kilocalorie) is the amount of energy needed to raise the temperature of a liter of water one degree Celsius. If you drink a liter of 45'F water (7'C), it takes 30 calories to raise that water to your body temperature of 98'F/37'C. 30 calories doesn't sound like a lot, but if you drink 2.5 liters of cold water a day, it works out to 10.5 lbs a year!

Anyway, that's why I'm freezing when I drink cold water -- heat is being transferred to the water from elsewhere in my body, which is having to burn energy to compensate and raise its temperature back up to normal, burning calories in the process. Isn't science nifty?